sub·ter·fuge (sŭb'tər-fyōōj') n. A deceptive stratagem or device: "the paltry subterfuge of an anonymous signature"(Robert Smith Surtees).
[French, from Old French suterfuge, from Late Latin subterfugium, from Latin subterfugere, to escape : subter, secretly, beneath; see upo in Indo-European roots + fugere, to flee.]
1573, from M.Fr. subterfuge, from L.L. subterfugium "an evasion," from L. subterfugere "to evade, escape, flee by stealth," from subter "beneath, secretly" + fugere "flee" (see fugitive).